90 degree mirror bracket
thingiverse
This is a bracket that connects to a 1.5" (40 mm) tube and holds a small mirrored tile to reflect light through a right angle. It can be used in a telescope (as in the project I made it for: https://danbscott.ghost.io/diy-telescope-part-2/) or a periscope (print two and put them on opposite ends of the tube).
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